Rechargeable lithium battery having a specific pressure means comprising a polymer gel material

• US 5,853,914 A
• Filed: 09/06/1996
• Issued: 12/29/1998
• Est. Priority Date: 09/06/1995
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kawakami, Soichiro
• Primary Examiner(s): KALAFUT, STEPHEN J
• Application Number:
  US08/709,448
• Time in Patent Office: 844 Days
• Field of Search: 429/66, 429/186, 429/190, 429/142
• US Class Current: 429/66
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0565 Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 10/0566 Liquid materials
• CPC Class Codes: H01M 2300/0082 Organic polymers
• CPC Class Codes: H01M 2300/0085 Immobilising or gelification of electrolyte
• CPC Class Codes: H01M 6/181 with polymeric electrolytes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A rechargeable lithium battery comprising at least a cathode, a separator, an anode, and an electrolyte or electrolyte solution integrated in a battery housing, characterized in that said rechargeable lithium battery is provided with a pressure means comprising a polymer gel for pressing said anode and cathode.

Claims

1. A rechargeable lithium battery comprising at least an anode, a separator, a cathode, and an electrolyte or electrolyte solution integrated in a battery housing, said rechargeable lithium battery being provided with a sheet comprising a polymer gel that presses said anode and cathode.

2. A rechargeable lithium battery according to claim 1, wherein the polymer gel is included in at least the separator so that it has a pressing function.

3. A rechargeable lithium battery according to claim 1, wherein the sheet contains a polymer gel capable of expanding or shrinking depending upon the concentration of a solvent.

4. A rechargeable lithium battery according to claim 1, wherein the polymer gel of the pressure means contains a material capable of being shrunk upon temperature rise to release the pressure between the anode and cathode.

5. A rechargeable lithium battery according to claim 1, wherein the polymer gel comprises a polymer with a molecular structure having side chains.

6. A rechargeable lithium battery according to claim 1, wherein the polymer gel is an ionic gel having at least one group capable of being dissociated into an ion.

7. A rechargeable lithium battery according to claim 1, wherein the sheet comprising the polymer gel comprises a support member for supporting the polymer gel.

8. A rechargeable lithium battery according to claim 7, wherein the support member comprises a nonwoven fabric.

9. A rechargeable lithium battery according to claim 1, wherein the polymer gel is in a powdery form.

10. A rechargeable lithium battery according to claim 7, wherein the polymer gel is arranged in or on the support member.

11. A rechargeable lithium battery according to claim 1, wherein the anode, separator and cathode are sequentially stacked into a stacked body and said stacked body is placed in a heat-shrinkable tubing.

12. A rechargeable lithium battery according to claim 11, wherein an end portion of the heat-shrinkable tubing on the side opposite to the other end portion of said heat-shrinkable tubing where power outputting terminals of the battery are situated is closed.

13. A rechargeable lithium battery having a stacked body comprising a plurality of cell units, each of said plurality of cell units comprising a cathode containing a cathode active material, a separator having an electrolyte solution retained therein, and an anode containing an anode active material sequentially stacked, characterized in that at least said stacked body is held between opposite sheets each comprising an expandable and shrinkable polymer gel.

14. A rechargeable lithium battery which comprises a stacked body comprising a cathode containing a cathode active material, a layer comprising an expandable and shrinkable polymer gel and having an electrolyte solution retained therein, and an anode containing an anode active material sequentially stacked, and a battery housing in which said stacked body is housed.

15. A rechargeable lithium battery comprising a stacked body housed in a battery housing, said stacked body comprising at least a cathode containing a cathode active material, a separator covered by a layer comprising an expandable and shrinkable polymer gel, and an anode containing an anode active material sequentially stacked.

16. A rechargeable lithium battery according to claim 15, wherein the stacked body has a cylindrical multiplet structure in which the stacked body is wound in multiple about an axis.

17. A rechargeable lithium battery comprising at least an anode, a separator, a cathode, and an electrolyte or electrolyte solution, integrated in a battery housing, said rechargeable lithium battery being provided with a polymer gel that presses said anode and cathode, said polymer gel being provided along a face of said anode or a face of said cathode, or both.

18. A rechargeable lithium battery according to claim 17, wherein the polymer gel is included in at least the separator so that it has a pressing function.

19. A rechargeable lithium battery according to claim 17, wherein the polymer gel is capable of expanding or shrinking depending upon the concentration of a solvent.

20. A rechargeable battery according to claim 17, wherein the polymer gel contains a material capable of being shrunk upon temperature rise to release the pressure between the anode and the cathode.

21. A rechargeable lithium battery according to claim 17, wherein the polymer gel comprises a polymer with a molecular structure having side chains.

22. A rechargeable lithium battery according to claim 17, wherein the polymer gel is an ionic gel having at least one group capable of being dissociated into an ion.

23. A rechargeable lithium battery according to claim 17, wherein the polymer gel comprises a sheet.

24. A rechargeable lithium battery according to claim 23, wherein the sheet comprises a support member for supporting the polymer gel.

25. A rechargeable lithium battery according to claim 24, wherein the support member comprises a non-woven fabric.

26. A rechargeable lithium battery according to claim 17, wherein the polymer gel is in a powdery form.

27. A rechargeable lithium battery according to claim 24, wherein the polymer gel is provided in or on the support member.

28. A rechargeable lithium battery according to claim 17, wherein the anode, separator, and cathode are sequentially stacked into a stacked body and said stacked body is placed in a heat-shrinkable tubing.

29. A rechargeable lithium battery according to claim 28, wherein an end portion of the heat-shrinkable tubing on the side opposite to the other end portion of said heat-shrinkable tubing where power outputting terminals of the battery are situated is closed.